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<?php function replace_unicode_escape_sequence($match) { var_dump($match); return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE'); } $str = "Bal\u00edky"; $str = preg_replace_callback('/\\\\u([0-9a-f]{4})/i', 'replace_unicode_escape_sequence', $str); echo $str;
Output for 4.3.0 - 7.1.0
array(2) { [0]=> string(6) "\u00ed" [1]=> string(4) "00ed" } BalĂ­ky